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- /*
- Minetest
- Copyright (C) 2010-2013 celeron55, Perttu Ahola <celeron55@gmail.com>
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 2.1 of the License, or
- (at your option) any later version.
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU Lesser General Public License for more details.
- You should have received a copy of the GNU Lesser General Public License along
- with this program; if not, write to the Free Software Foundation, Inc.,
- 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
- */
- #ifndef DAYNIGHTRATIO_HEADER
- #define DAYNIGHTRATIO_HEADER
- inline u32 time_to_daynight_ratio(float time_of_day, bool smooth)
- {
- float t = time_of_day;
- if(t < 0)
- t += ((int)(-t)/24000)*24000;
- if(t >= 24000)
- t -= ((int)(t)/24000)*24000;
- if(t > 12000)
- t = 24000 - t;
- float values[][2] = {
- {4250+125, 150},
- {4500+125, 150},
- {4750+125, 250},
- {5000+125, 350},
- {5250+125, 500},
- {5500+125, 675},
- {5750+125, 875},
- {6000+125, 1000},
- {6250+125, 1000},
- };
- if(!smooth){
- float lastt = values[0][0];
- for(u32 i=1; i<sizeof(values)/sizeof(*values); i++){
- float t0 = values[i][0];
- float switch_t = (t0 + lastt) / 2;
- lastt = t0;
- if(switch_t <= t)
- continue;
- return values[i][1];
- }
- return 1000;
- } else {
- for(u32 i=0; i<sizeof(values)/sizeof(*values); i++){
- if(values[i][0] <= t)
- continue;
- if(i == 0)
- return values[i][1];
- float td0 = values[i][0] - values[i-1][0];
- float f = (t - values[i-1][0]) / td0;
- return f * values[i][1] + (1.0 - f) * values[i-1][1];
- }
- return 1000;
- }
- }
- #endif
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